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OALib Journal期刊
ISSN: 2333-9721
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液态金属冷却工艺对nial--cr(mo)--hf(ho)定向合金组织的影响
Keywords: 金属材料,金属间化合物,nial合金,定向凝固工艺,液态金属冷却技术,显微组织
Abstract:
？用液态金属冷却技术(lmc)和传统的定向凝固技术(hrs)制备了名义成分为ni--33al--31cr--2.9mo--0.1hf--0.05ho(%,原子分数)的定向合金,研究了制备工艺对其组织的影响.结果表明,合金由初生nial枝晶、nial/cr(mo)共晶胞和少量hf固溶体组成.与hrs工艺相比,lmc工艺能提高固液前沿温度梯度和冷却速度.较高的固液前沿温度梯度扩大了nial/cr(mo)共晶共生区成分范围,减少初生nial枝晶的体积分数.而较高的冷却速度抑制固溶元素扩散,细化定向合金的组织,增加合金中固溶元素总量.另外,lmc工艺能避免hrs工艺中产生的生长缺陷,包括斑点、nial一次枝晶的偏转和nial一次枝晶的不连续.
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